# Atmel EDBG-based Tools Protocols
Housekeeping Commands

#### JTAG scan-chain detection

Performs an auto detection of JTAG devices. If no devices are found, JTAG enable sequences for various families are applied and the detection retried. If any device on the scan chain does not have JTAG enabled, the "use reset" parameter can help to enable JTAG. (This will not necessarily work with devices not manufactured by Atmel.)

Table 60. JTAG scan-chain detection command format

Field | Size | Description
--- | --- | ---
CMD_HOUSEKEEPING_JTAG_DETECT | 1 byte | Command ID
Version (0x00) | 1 byte | Command version
Use reset | 1 byte | 0 = External reset will NOT be applied 1 = External reset will be applied

Responses:

- LIST of 32-bit JTAG IDs

- FAILED

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